Rela??es entre propriedades químicas, físicas e energéticas da madeira de cinco espécies de cerrado.

摘要

This work aimed at characterizing and evaluating the influence of the chemical properties (lignin, holocellulose and extratives contents) of five Cerrado wood species ( Pterodon pubescens, Dalbergia miscolobium, Sclerolobium paniculatum, Stryphnodendron adstringens and Vochysia thyrsoidea ) on density and shrinkage wood; gravimetric yield and apparent density of charcoal. The samples were collected in area of forest management in Brasilia (Brazil, DC), from three trees of each species, thus making a total of 15 samples. No significant differences among species were detected for wood extractive content and charcoal gravimetric yield. Pterodon pubescens, Dalbergia miscolobium and Sclerolobium paniculatum stood out by presenting, respectively, the highest basic density (0.82, 0.80 and 0.78 g/cm 3 ); the greatest content of lignin (31.74, 32.31 and 31, 42%), the highest charcoal apparent density (37, 43 and 37%). On the other hand, Stryphnodendron adstringens and Vochysia thyrsoidea stood out by presenting, respectively, the highest content of holocellulose (72.22% and 74.84). The lignin showed positive and significant correlation with the basic density and wood charcoal apparent density; showed no significant correlation with the volumetric shrinkage neither gravimetric yeild. The holocellulose content showed negative and significant correlation with the density of the wood, and charcoal apparent density. The total extractives not provided with any significance studied of variables.